The report on the killing of Naomi Bryant has put the spotlight on the treatment of offenders who have been released on licence. BBC News looks at the recent cases that have highlighted the Probation Service's difficulties.
Mary-Ann Leneghan was found dead in a Reading park
The then Home Secretary Charles Clarke said it was vital for the service to learn lessons from the Mary-Ann Leneghan case.
Mary-Ann, 16, and her 18-year-old friend were abducted in central Reading last May before being taken to a guesthouse, where they were raped and tortured.
They were then driven to the Berkshire town's Prospect Park to be killed.
Mary-Ann died from repeated stab wounds while her friend, who cannot be named, was shot in the head but survived.
Four of Mary-Ann's killers - drug-dealer Adrian Thomas, 20, of Battersea, and fellow gang-members Michael Johnson, 19, of Southfields, Jamaile Morally, 22, of Balham, and Indrit Krasniqi, 18, of Chiswick - were under supervision in the community at the time of the killing.
Ms Bates died defending her daughter
Nottingham jeweller Marian Bates was shot dead in her family shop in September 2003.
She was trying to shield her daughter Xanthe from the attack of 19-year-old cocaine addict Peter Williams, who has since been jailed for the murder.
Williams had been released from a young offenders institution on licence only 20 days before Mrs Bates's murder, and was fitted with an electronic tag.
But authorities failed act quickly enough when he repeatedly breached his curfew order and removed the electronic tag, an official report found.
Williams had been in trouble with the law since the age of 11 for offences including burglary and indecent assault.
John Monckton was stabbed to death during a burglary at his home
Banker John Monckton was stabbed to death during a burglary at his family home in Chelsea, west London, in November 2004.
The killer, 25-year-old Damien Hanson, had been released halfway through a 12-year sentence for attempted murder.
Chief inspector of probation Andrew Bridges published a report on the financier's murder and concluded there were "serious deficiencies" in the way Hanson was dealt with.
Several probation officers were suspended following the report's publication.
Robert Symons struggled with a burglar before he was killed
In October 2004, teacher Robert Symons, 45, was stabbed in the heart with a large kitchen knife when he disturbed a burglary at his west London home.
Crack addict Yusuf Bouhaddaou was jailed for the murder.
Just five weeks before the killing, Bouhaddaou had been released on licence from a five-and-a-half-year sentence which included four years for a series of domestic burglaries.
He admitted committing a number of burglaries after leaving prison to fund his drug addiction.
Bouhaddaou was under the supervision of the London Probation Service at the time he killed Mr Symons.
An inquiry into the murder has yet to publish its findings.